Putter head provided with intermediate member

ABSTRACT

A putter head including a replaceable intermediate member that can be customized in size, shape, and performance according to user&#39;s preference is provided. A putter head according to an embodiment includes a front member having a shaft attachment portion and a front surface constituting a face surface, a rear member attached to a rear of the front member, and an intermediate member that is disposed between the front member and the rear member and is replaceable, and the intermediate member is selectable from a plurality of intermediate members formed in different sizes, shapes, or materials.

Cross Reference to Related Applications

The present application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/JP2020/038552 filed on Oct. 13, 2020 which claims priority based on Japanese Patent Application No. 2019-222933 (filed on Dec. 10, 2019) and Japanese Patent Application No. 2020-171257 (filed on Oct. 9, 2020), the contents of which are incorporated herein by reference in their entirety.

FIELD

The present disclosure relates to a putter head for constituting a golf putter, and particularly to a putter head provided with a customizable intermediate member.

BACKGROUND

Conventionally, a technique has been proposed in which an insert made of urethane resin or the like is provided between a front member and a rear member of a putter head in order to absorb impact and improve hitting feeling when hitting a ball with the putter head. For example, Japanese Patent Application Laid-Open No. 11-114112 discloses a putter head in which a front portion provided with a face surface for hitting a ball and including a shaft attachment portion and a rear portion behind the face surface are bonded to form a head body, the front portion is formed by cutting an ingot, and the rear portion is formed by casting.

In addition, a technique has also been proposed in which, by making a front half body and a rear half body replaceable, the putter characteristics can be adjusted according to the physical condition on the playing day, the type and situation of the turf of the putting green, and the like. For example, Japanese Patent Application Laid-Open No. 2009-297210 discloses a putter head including a front half body having a shaft attachment portion and a front surface serving as a face surface, a rear half body detachably attached to the rear side of the front half body, and an insert made of rubber or a synthetic resin and disposed between the front half body and the rear half body, in which the insert includes a first insert having a flat plate shape and a second insert that is integral with or separate from the first insert, has a smaller area than the first insert, and is disposed on the front surface side of the first insert, and a recess portion into which the second insert is fitted is provided on the rear surface of the front half body.

CITATION LIST Patent Literature

Patent Literature 1: Japanese Patent Application Laid-Open No. 11-114112 A

Patent Literature 2: Japanese Patent Application Laid-Open No. 2009-297210 A

SUMMARY

However, in the putter head disclosed in Patent Literature 1, it is intended to closely attach the insert between the front member and the rear member without a gap, and there is a problem that it is difficult to perform customization according to required performance in the first place. In contrast, in the putter head disclosed in Patent Literature 2, although the front half body and the rear half body of the head can be replaced in order to adjust the putter characteristics, there is a problem that it is difficult to customize the performance on the assumption that the same front half body and rear half body are used.

An object of an embodiment of the present disclosure is to provide a putter head including a replaceable intermediate member that can be customized in size, shape, and performance according to user's preference. Other objects of the embodiment of the present disclosure will become apparent by reference to the entire specification.

A putter head according to an embodiment of the present disclosure includes a front member having a shaft attachment portion and a front surface constituting a face surface, a rear member attached to a rear of the front member, and a replaceable intermediate member that is disposed between the front member and the rear member, and the intermediate member is selectable from a plurality of intermediate members formed in different sizes, shapes, or materials.

In the putter head according to an embodiment of the present disclosure, the intermediate member is configured to have a smaller specific gravity than the front member and the rear member. In addition, the intermediate member is configured to have a smaller specific gravity in the center region thereof than in an end portion thereof.

In the putter head according to an embodiment of the present disclosure, the plurality of intermediate members is formed so as to be different in at least one of material, specific gravity, shape, size, color, finishing, and manufacturing method. Here, in the putter head according to an embodiment of the present disclosure, the intermediate member can be formed from one or a plurality of constituent members.

In the putter head according to an embodiment of the present disclosure, the material of the plurality of intermediate members is resin, metal, or wood. In the putter head according to an embodiment of the present disclosure, the material of the plurality of intermediate members is cork, resin, plastic, foamed resin, aluminum, titanium, iron, stainless steel, or tungsten.

In the putter head according to an embodiment of the present disclosure, the shape of the plurality of intermediate members is quadrangular, polygonal, or arcuate.

In the putter head according to an embodiment of the present disclosure, the specific gravity of the plurality of intermediate members is 0.1 to 18.

In the putter head according to an embodiment of the present disclosure, an insert member for shock absorption is provided at least either between the intermediate member and the front member or between the intermediate member and the rear member.

In the putter head according to an embodiment of the present disclosure, the insert member is formed from rubber or synthetic resin.

The putter head according to an embodiment of the present disclosure includes a front member having a shaft attachment portion and a front surface constituting a face surface, a rear member attached to a rear of the front member, and the putter head further includes a replaceable intermediate member that is disposed between the front member and the rear member, and the intermediate member is configured to have a smaller specific gravity than the front member and the rear member In addition, the intermediate member is configured to have a smaller specific gravity in the center region thereof than in an end portion thereof.

According to various embodiments of the present disclosure, a putter head including a replaceable intermediate member that can be customized in size, shape, and performance according to user's preference can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a perspective view of a putter head 1 according to an embodiment.

FIG. 2 illustrates an exploded perspective view of the putter head 1 according to an embodiment.

FIG. 3 illustrates an exploded perspective view of the putter head 1 according to an embodiment.

FIG. 4 illustrates an exploded perspective view of the putter head 1 according to an embodiment.

FIG. 5 illustrates an exploded perspective view of the putter head 1 according to an embodiment.

FIG. 6 illustrates an exploded perspective view of the putter head 1 according to an embodiment.

FIG. 7 illustrates an exploded perspective view of the putter head 1 according to an embodiment.

FIG. 8 illustrates an exploded perspective view of the putter head 1 according to an embodiment.

FIG. 9 illustrates an exploded perspective view of the putter head 1 according to an embodiment.

FIG. 10 illustrates a performance comparison of the putter head 1 according to an embodiment.

DETAILED DESCRIPTION

Hereinafter, various embodiments of the present disclosure will be described with reference to the drawings as appropriate. To be noted, common constituent elements in the drawings are denoted by the same reference numerals.

FIG. 1 is a perspective view schematically illustrating a configuration of a putter head 1 according to an embodiment of the present disclosure. FIG. 2 is an exploded perspective view schematically illustrating a configuration of the putter head 1 according to an embodiment of the present disclosure. The putter head 1 according to an embodiment of the present disclosure includes a front member 10, a rear member 20, and an intermediate member 30 interposed between these. Here, in the putter head 1 according to an embodiment of the present disclosure, the intermediate member 30 can be formed from one or a plurality of constituent members. As illustrated in FIG. 2 , the putter head 1 according to an embodiment of the present disclosure may include an anti-vibration member 40 between the front member 10 and the intermediate member 30.

A circular hole 12 is provided on each of the toe side and the heel side of a face surface 11 of the front member 10, and an insertion hole 12 a for a bolt 13 is provided to penetrate from a deep bottom surface of the circular hole 12 toward the back surface. A hosel 14 is provided to protrude from the heel side of the upper surface of the front member 10. The hosel 14 includes a vertical rod portion 14 a, a front extending portion 14 b extending forward (forward as viewed from the face surface 11) from an upper end of the vertical rod portion 14 a, and a hosel hole portion 14 c rising upward from the front extending portion 14 b. A distal end of a shaft (not illustrated) is inserted into the hosel hole portion 14 c and fixed with an adhesive or the like. A grip (not illustrated) is attached to the proximal end side of the shaft.

The putter head 1 according to an embodiment of the present disclosure includes the front member 10 having a shaft attachment portion (hosel) 14 and a front surface constituting the face surface 11, and the rear member 20 attached to the rear of the front member 10, and includes the replaceable intermediate member 30 disposed between the front member 10 and the rear member 20, and the intermediate member 30 can be selected from a plurality of intermediate members formed in different sizes, shapes, or materials. Examples of the intermediate member include cork, resin, plastics, foamed resin, aluminum, titanium, iron, stainless steel, tungsten, and the like, but are not limited thereto. To be noted, although the intermediate member 30 is disposed between the front member 10 and the rear member 20, a part of the intermediate member 30 may extend to or beyond the position of at least one of the front member 10 and the rear member 20 (the position of the front member or the position of the rear member in the front-rear direction). Further, a part of the intermediate member 30 may be configured to be larger than the width of at least one of the front member 10 and the rear member 20 in the width direction thereof.

With the putter head 1 according to an embodiment of the present disclosure, a putter head including a replaceable intermediate member that can be customized in size, shape, and performance according to user's preference can be provided.

In addition, the putter head 1 according to an embodiment of the present disclosure includes the front member 10 having the shaft attachment portion 14 and the front surface constituting the face surface 11, and the rear member 20 attached to the rear of the front member 10, in which the putter head 1 further includes the replaceable intermediate member 30 that is disposed between the front member 10 and the rear member 20, and the intermediate member 30 has a smaller specific gravity than the front member 10 and the rear member 20. The specific gravity of the intermediate member 30 is, for example, 0.1 to 18. For example, the specific gravity of foamed resin and cork are about 0.1, the specific gravity of the specific gravity of tungsten alloy, lead alloy, and copper alloy are about 18, and a material having a specific gravity in the middle therebetween is also conceivable.

With the putter head 1 according to an embodiment of the present disclosure, since the specific gravity of the intermediate member is small, it is possible to suppress an increase in the overall weight of the head even when the size is increased, and therefore it is possible not only to perform customization according to the user's preference while maintaining the overall balance of the head, but also to increase the moment of inertia by arranging members having large specific gravity in the front and the rear.

In the putter head 1 according to an embodiment of the present disclosure, the plurality of intermediate members 30 are formed so as to be different in at least one of material, specific gravity, shape, size, color, finishing, and manufacturing method.

In the putter head 1 according to an embodiment of the present disclosure, the material of the plurality of intermediate members is resin, metal, or wood, but is not limited thereto. In the putter head 1 according to an embodiment of the present disclosure, the material of the plurality of intermediate members is, for example, cork, resin, plastic, foamed resin, aluminum, titanium, iron, stainless steel, or tungsten, but other materials can be also appropriately employed.

In the putter head 1 according to an embodiment of the present disclosure, the shape of the plurality of intermediate members 30 may be, for example, a quadrangular shape, a polygonal shape, or an arcuate shape, but is not limited thereto. Here, the quadrangular shape, the polygonal shape, or the arcuate shape does not have a mathematically strict meaning, and includes a substantially quadrangular shape, a substantially polygonal shape, or a substantially arcuate shape, or may have a shape other than these.

In the putter head 1 according to an embodiment of the present disclosure, the size of the plurality of intermediate members 30 may be set such that, for example, the width between the front member and the rear member is 3 mm to 100 mm, but is not limited thereto.

In the putter head 1 according to an embodiment of the present disclosure, the finishing of the plurality of intermediate members 30 can be performed by, for example, plating, metal vapor deposition, coating, polishing, shot blasting, or the like, but is not limited thereto. In addition, in the putter head 1 according to an embodiment of the present disclosure, the plurality of intermediate members 30 can be manufactured by, for example, cutting, injection molding, casting, die casting, forging, or the like, but is not limited thereto.

In the putter head 1 according to an embodiment of the present disclosure, an insert member 40 for shock absorption may be provided at least either between the intermediate member 30 and the front member 10 or between the intermediate member 30 and the rear member 20. In the putter head 1 according to an embodiment of the present disclosure, the insert member 40 is formed from rubber or synthetic resin. In the example of FIG. 2 (referred to as STD), the putter head 1 is configured to include an anti-vibration member 40 between the front member 10 and the intermediate member 30, and the anti-vibration member 40 is formed from EPDM rubber.

Next, what embodiment is conceivable as a different intermediate member 30 will be described more specifically with reference to FIGS. 3 to 5 . FIG. 3 is an exploded perspective view schematically illustrating a configuration (referred to as MID) of the putter head 1 according to an embodiment of the present disclosure. The putter head 1 according to an embodiment of the present disclosure includes a front member 10, a rear member 20, and an intermediate member 30 interposed between these. As compared with the intermediate member 30 illustrated in FIG. 2 , the intermediate member 30 illustrated in FIG. 3 has a large width in the front-rear direction, which is 30 mm. As illustrated in FIG. 3 , the putter head 1 according to an embodiment of the present disclosure may include the anti-vibration member 40 between the front member 10 and the intermediate member 30. In the example of FIG. 2 , the depth of the center of gravity is smaller and the moment of inertia (MOI) is smaller than in the embodiment of FIG. 3 . It is suitable for a player who has a small swing stroke and who adjusts a sense of distance by a tempo or a stroke feeling to control directivity or a distance by himself/herself according to the sense. On the other hand, it is suitable for a player who has a large swing stroke and who adjusts a sense of distance by a tempo or a swing width to swing more stably.

Similarly to FIG. 2 , in the putter head 1 illustrated in FIG. 3 , the circular hole 12 is provided on each of the toe side and the heel side of the face surface 11 of the front member 10, and the insertion hole 12 a for the bolt 13 is provided to penetrate from a deep bottom surface of the circular hole 12 toward the back surface. A hosel 14 is provided to protrude from the heel side of the upper surface of the front member 10. The hosel 14 includes a vertical rod portion 14 a, a front extending portion 14 b extending forward (forward as viewed from the face surface 11) from an upper end of the vertical rod portion 14 a, and a hosel hole portion 14 c rising upward from the front extending portion 14 b. A distal end of a shaft (not illustrated) is inserted into the hosel hole portion 14 c and fixed with an adhesive or the like. A grip (not illustrated) is attached to the proximal end side of the shaft.

Next, FIG. 4 is an exploded perspective view schematically illustrating a configuration (referred to as WIDE) of the putter head 1 according to an embodiment of the present disclosure. To be noted, the configuration of the putter head 1 having the same shape as that of WIDE and having the same weight as that of STD will be hereinafter referred to as WIDE 360. The putter head 1 according to an embodiment of the present disclosure includes a front member 10, a rear member 20, and an intermediate member 30 interposed between these. As compared with the intermediate member 30 illustrated in FIG. 3 , the intermediate member 30 illustrated in FIG. 4 has a larger width in the front-rear direction, which is 50 mm. As illustrated, the putter head 1 according to an embodiment of the present disclosure may include the anti-vibration member 40 between the front member 10 and the intermediate member 30. The other elements are basically similar to those in FIGS. 2 and 3 , and thus details thereof will be omitted. In the example of FIG. 4 , the depth of the center of gravity is larger and the moment of inertia (MOI) is larger than in the embodiment of FIG. 3 . It is suitable for a player who has a large swing stroke and who adjusts a sense of distance by a tempo or a swing width to swing further stably. The larger the value of the moment of inertia (MOI) is, the more difficult it is for the player to adjust the directivity and the sense of distance, but this leads to further improvement in stability of stroke and impact.

Furthermore, a configuration (referred to as WIDE 360) of the putter head 1 according to an embodiment of the present disclosure will be described with reference to FIG. 5 . FIG. 5 is an exploded perspective view schematically illustrating a configuration of the putter head 1 according to an embodiment of the present disclosure. The putter head 1 according to an embodiment of the present disclosure includes a front member 10, a rear member 20, and an intermediate member 30 interposed between these. As compared with the intermediate member 30 illustrated in FIGS. 3 and 4 , the intermediate member 30 illustrated in FIG. 5 has a further larger width in the front-rear direction, which is 65 mm. As illustrated, the putter head 1 according to an embodiment of the present disclosure may include the anti-vibration member 40 between the front member 10 and the intermediate member 30. The other elements are basically similar to those in FIGS. 2 and 3 , and thus details thereof will be omitted. In the example of FIG. 5, the depth of the center of gravity is larger and the moment of inertia (MOI) is larger than in the embodiment of FIG. 4 . It is suitable for a player who has a large swing stroke and who adjusts a sense of distance by a tempo or a swing width to swing further stably. The larger the value of the moment of inertia (MOI) is, the more difficult it is for the player to adjust the directivity and the sense of distance, but this leads to further improvement in stability of stroke and impact.

In this manner, by selecting various intermediate members, customization according to user's preference can be performed. In addition, by reducing the specific gravity of the intermediate member, it is possible to suppress an increase in the overall weight of the head even when the size is increased, and therefore it is possible to maintain the overall balance of the head and to increase the moment of inertia by arranging members having large specific gravity in the front and the rear.

Next, referring to FIG. 10 , the results of the velocity, the angular velocity, and the spin amount for each embodiment of FIGS. 2 to 4 (in the embodiment of FIG. 4 , both WIDE and WIDE 360 are included) are illustrated separately for 0.03 s after impact and for 0.01 s after first bound. Measurement is performed three times for each embodiment, and the results are illustrated taken together with the average value. Here, in FIG. 10 , as described above, the embodiment of FIG. 2 is illustrated as corresponding to STD, the embodiment of FIG. 3 is illustrated as corresponding to MID, and the embodiment of FIG. 4 is illustrated as corresponding to WIDE and WIDE 360.

First, the test results of STD and MID are compared. As illustrated, in STD, the average velocity is 2.19 m/s and the average angular velocity is −180 deg/s at impact, and the average velocity is 2.12 m/s and the average angular velocity is 713 deg/s at the first bound, whereas in MID, the average velocity is 2.27 m/s and the average angular velocity is −181 deg/s at impact, and the average velocity is 2.22 m/s and the average angular velocity is 664 deg/s at the first bound.

In addition, as illustrated, in STD, the average spin amount at impact is −30.0 rpm and the average spin amount at the first bound is 118.9 rpm, whereas in MID, the average spin amount at impact is 30.1 rpm and the average spin amount at the first bound is 110.7 rpm.

From these results, it can be seen that STD has a smaller depth of the center of gravity and a smaller moment of inertia (MOI) than MID, and thus STD is suitable for a player who has a smaller swing stroke and adjusts a sense of distance by a tempo or a stroke feeling to control directivity or a distance by himself/herself according to the sense. In addition, it can be seen that STD has a feature that too much rolling does not happen as compared with MID even when a strong impact is made with a short stroke. In contrast, it can be seen that MID is suitable for a player who has a large swing stroke and who adjusts a sense of distance by a tempo or a swing width to swing more stably.

Next, the test results of WIDE and MID are compared. As illustrated, in WIDE, the average velocity is 2.41 m/s and the average angular velocity is −180.6 deg/s at impact, and the average velocity is 2.27 m/s and the average angular velocity is 548 deg/s at the first bound, whereas in MID, the average velocity is 2.27 m/s and the average angular velocity is −181 deg/s at impact, and the average velocity is 2.22 m/s and the average angular velocity is 664 deg/s at the first bound.

In addition, as illustrated, in WIDE, the average spin amount at impact is −30.1 rpm and the average spin amount at the first bound is 91.3 rpm, whereas in MID, the average spin amount at impact is 30.1 rpm and the average spin amount at the first bound is 110.7 rpm.

From these, it can be seen that, in WIDE, as compared with MID, the depth of the center of gravity is larger, the moment of inertia (MOI) is larger, and when the value of the moment of inertia (MOI) is larger, although it is more difficult for the player to adjust the directivity and the sense of distance, the stability of stroke and impact is further improved.

Next, the test results of WIDE and WIDE 360 are compared. As illustrated, in WIDE, the average velocity is 2.41 m/s and the average angular velocity is −180.6 deg/s at impact, and the average velocity is 2.27 m/s and the average angular velocity is 548 deg/s at the first bound, whereas in WIDE 360, the average velocity is 2.26 m/s and the average angular velocity is −121 deg/s at impact, and the average velocity is 2.22 m/s and the average angular velocity is 412 deg/s at the first bound.

In addition, as illustrated, in WIDE, the average spin amount at impact is −30.1 rpm and the average spin amount at the first bound is 91.3 rpm, whereas in WIDE 360, the average spin amount at impact is −20.13 rpm and the average spin amount at the first bound is 68.6 rpm.

From these, it can be seen that, in WIDE, as compared with WIDE 360 that is lightweight and whose weight is approximately equal to that of STD, the depth of the center of gravity is larger, the moment of inertia (MOI) is larger, and when the value of the moment of inertia (MOI) is larger, although it is more difficult for the player to adjust the directivity and the sense of distance, the stability of stroke and impact is further improved. In addition, the appearance of WIDE 360 is the same as that of WIDE, but performance close to MID overall can be exhibited, and selection according to the preference of the player can be performed.

Furthermore, a modification example of the example illustrated in FIG. 5 will be described with reference to FIGS. 6 to 9 as to what embodiments are conceivable as different intermediate members 30. FIG. 6 is a perspective view schematically illustrating a configuration of the putter head 1 according to an embodiment of the present disclosure. The putter head 1 according to an embodiment of the present disclosure includes a front member 10, a rear member 20, and an intermediate member 30 interposed between these. Similarly to FIG. 5 , the intermediate member 30 illustrated in FIG. 6 has the same width in the front-rear direction, which is 65 mm, but from the viewpoints of improvement of moment of inertia, weight reduction, and designability, an approximately triangular notch 50 is formed in a center portion. The other elements are basically similar to those in FIGS. 2 and 3 and the like, and thus details thereof will be omitted. An effect that the player can easily pull straight at the time of stroke (improvement in alignability) is exhibited. In addition, when the intermediate member 30 becomes larger, the hitting sound at the time of hitting a ball tends to resonate bluntly, and providing the notch shape also has an effect of suppressing the reverberation sound at the time of hitting a ball (particularly when the width of the intermediate member is about 10 mm or more, the hitting sound tends to become blunt).

FIG. 7 is a perspective view schematically illustrating a configuration of the putter head 1 according to an embodiment of the present disclosure. The putter head 1 according to an embodiment of the present disclosure includes a front member 10, a rear member 20, and an intermediate member 30 interposed between these. Similarly to FIGS. 5 and 6 , the intermediate member 30 illustrated in FIG. 7 has the same width in the front-rear direction, which is 65 mm, but from the viewpoints of improvement of moment of inertia, weight reduction, and improvement of rigidity, an approximately quadrangular notch 51 and a rigidity reinforcing member 60 are formed in a center portion. The other elements are basically similar to those in FIGS. 2 and 3 and the like, and thus details thereof will be omitted. As described above, an effect that the player can easily pull straight at the time of stroke (improvement in alignability) is exhibited. In addition, when the intermediate member 30 becomes larger, the hitting sound at the time of hitting a ball tends to resonate bluntly, and providing the notch shape also has an effect of suppressing the reverberation sound at the time of hitting a ball (particularly when the width of the intermediate member is about 10 mm or more, the hitting sound tends to become blunt).

FIG. 8 is a perspective view schematically illustrating a configuration of the putter head 1 according to an embodiment of the present disclosure. The putter head 1 according to an embodiment of the present disclosure includes a front member 10, a rear member 20, and an intermediate member 30 interposed between these. Similarly to FIGS. 5, 6, and 7 , the intermediate member 30 illustrated in FIG. 8 has the same width in the front-rear direction, which is 65 mm, but from the viewpoints of improvement of moment of inertia, weight reduction, and designability, an approximately circular notch 52 is formed at two positions in a center portion. The other elements are basically similar to those in FIGS. 2 and 3 and the like, and thus details thereof will be omitted. An effect that the player can easily pull straight at the time of stroke (improvement in alignability) is exhibited. In addition, when the intermediate member 30 becomes larger, the hitting sound at the time of hitting a ball tends to resonate bluntly, and providing the notch shape also has an effect of suppressing the reverberation sound at the time of hitting a ball (particularly when the width of the intermediate member is about 10 mm or more, the hitting sound tends to become blunt).

FIG. 9 is a perspective view schematically illustrating a configuration of the putter head 1 according to an embodiment of the present disclosure. The putter head 1 according to an embodiment of the present disclosure includes a front member 10, a rear member 20, and an intermediate member 30 interposed between these. Similarly to FIGS. 5, 6, 7, and 8 , the intermediate member 30 illustrated in FIG. 9 has the same width in the front-rear direction, which is 65 mm, but from the viewpoints of improvement of moment of inertia, weight reduction, and improvement of rigidity, an approximately elongated circular notch 53 is formed at two positions in a center portion. The other elements are basically similar to those in FIGS. 2 and 3 and the like, and thus details thereof will be omitted. An effect that the player can easily pull straight at the time of stroke (improvement in alignability) is exhibited. In addition, when the intermediate member 30 becomes larger, the hitting sound at the time of hitting a ball tends to resonate bluntly, and providing the notch shape also has an effect of suppressing the reverberation sound at the time of hitting a ball (particularly when the width of the intermediate member is about 10 mm or more, the hitting sound tends to become blunt).

In this manner, by selecting various intermediate members of the same size, customization according to user's preference can be performed. In addition, by reducing the specific gravity of the intermediate member, it is possible to suppress an increase in the overall weight of the head even when the size is increased, and therefore it is possible to maintain the overall balance of the head and to increase the moment of inertia by arranging members having large specific gravity in the front and the rear.

The dimensions, materials, and arrangements of each constituent element described in the present specification are not limited to those explicitly described in the embodiments, and each constituent element may be modified to have any dimensions, materials, and arrangements that may fall within the scope of the present disclosure. In addition, constituent elements not explicitly described in the present specification may be added to the described embodiments, or some of the constituent elements described in each embodiment may be omitted.

REFERENCE SIGNS LIST

-   1 putter head -   10 front member -   11 face surface -   12 circular hole -   12 a insertion hole -   13 bolt -   14 hosel -   14 a vertical rod portion -   14 b front extending portion -   14 c hosel hole portion -   20 rear member -   30 intermediate member -   40 anti-vibration member -   50 notch -   51 notch -   52 notch -   53 notch -   rigidity reinforcing member 

1. A putter head comprising: a front member having a shaft attachment portion and a front surface constituting a face surface; and a rear member attached to a rear of the front member, wherein the putter head further comprises a replaceable intermediate member that is disposed between the front member and the rear member, and the intermediate member is selectable from a plurality of intermediate members formed in different sizes, shapes, or materials, and the intermediate members of different sizes are at least three intermediate members that are different in a width in a front-rear direction.
 2. The putter head according to claim 1, wherein the intermediate member has a smaller specific gravity than the front member and the rear member.
 3. The putter head according to claim 1, wherein the plurality of intermediate members is formed so as to be different in at least one of material, specific gravity, shape, size, color, finishing, and manufacturing method.
 4. The putter head according to claim 1, wherein a material of the plurality of intermediate members is resin, metal, or wood.
 5. The putter head according to claim 4, wherein the material of the plurality of intermediate members is cork, resin, plastic, foamed resin, aluminum, titanium, iron, stainless steel, or tungsten.
 6. The putter head according to claim 1, wherein a shape of the plurality of intermediate members is quadrangular, polygonal, or arcuate.
 7. The putter head according to claim 1, wherein a specific gravity of the plurality of intermediate members is 0.1 to
 18. 8. The putter head according to claim 1, wherein the intermediate member is formed from one or a plurality of constituent members.
 9. The putter head according to claim 1, wherein an insert member for shock absorption is provided at least either between the intermediate member and the front member or between the intermediate member and the rear member.
 10. The putter head according to claim 9, wherein the insert member is formed from rubber or synthetic resin.
 11. A putter head comprising: a front member having a shaft attachment portion and a front surface constituting a face surface; and a rear member attached to a rear of the front member, wherein the putter head further comprises a replaceable intermediate member that is disposed between the front member and the rear member, and the intermediate member has a smaller specific gravity than the front member and the rear member.
 12. The putter head according to claim 2, wherein the intermediate member has a smaller specific gravity in a center region than in an end portion of the intermediate member. 